NORDITERPENES AND NORSESTERTERPENES FROM SALVIA-YOSGADENSIS

The aerial parts of Salvia yosgadensis afforded five new terpenes with unusual skeletons, together with two known norditerpenes, ambreinolid e and norambreinolide. The new compounds were elucidated as 6 alpha-hy droxyambreinolide, 6 alpha-hydroxynorambreinolide, 6 alpha-hydroxy-8 a lpha-acetoxy-13,14,15,16-tetranorlabdan-12-oic acid, and two 19,20-din orsesterterpenes, named as yosgadensonol and 13-epi-yosgadensonol. The ir structures were determined by spectroscopic means, particularly by extensive 1D and 2D NMR studies.